break type checking out of code standards action

.github/workflows/coding_standards.yml → .github/workflows/format_lint.yml

@@ -3,7 +3,7 @@ on: push
 
 jobs:
   check_code_standards:
-    name: Format, lint, type check code
+    name: Format, lint code
     runs-on: ubuntu-latest
 
     steps:
@@ -30,7 +30,4 @@ jobs:
         run: black .
 
       - name: Run `ruff` linter / formatter
-        run: ruff check .
-
-      - name: Run `mypy` type checker
-        run: mypy --strict .
+        run: ruff check .

.github/workflows/type_check.yml

@@ -0,0 +1,30 @@
+name: Type checking
+on: push
+
+jobs:
+  type_check:
+    name: Format, lint code
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: 3.11
+
+      - name: Display Python version
+        run: python -c "import sys; print(sys.version)"
+
+      - name: Install dependencies
+        run: | 
+          pip install setuptools --upgrade
+          pip install .[type_checking]
+
+      - name: Install package
+        run: pip install .
+
+      - name: Run `mypy` type checker
+        run: mypy --strict .